Automatic-operating air-compressor.



No. 639,539. Patented Dec. I9,' I899. G. E. DRUM.

AUTOMATIC OPERATING AIR COMPRESSOR.

(Application filed Nov. 1, 1898.)

2 Sheets-Sheet I.

(No Model.)

INVENTOR &, QM

WITNESSES:

ATTORNEY.

TNE cams s-Enzns co, Fnmuumo WASHINGTON. a c.

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No. 639,539. Patented Dec. I9, 1899.

a. E. nnum. K

AUTOMATIC OPERATING AIR COMPRESSOR.

(Application filed Nov. 1, 1898.) (No Model.) v 2 SheetsSheet 2.

, WITNESSES: INVENTOR UNITED GEORGE E. DRUM, OF PHILADELPHIA,PENNSYLVANIA, ASSIGNOR OF ONE HALF TO ROBERT P. SMITH, OF SAME PLACE.

AUTOMATIC-OPERATING AIR-COM PRESSOR.

SPECIFICATION forming part of Letters Patent No. 639,539, dated December19, 1899. Application fllecl November 1, 1898. SerialNo. 695,148. (Nomodel.)

To all whom, it may concern:

Be it known that I, GEORGE E. DRUM, acitizen of the United States,residing at Philadelphia, in the county of Philadelphia and State ofPennsylvania, have invented a new and useful Improvement inAutomatic-Operating Air-Compressors, of which the following is aspecification.

My invention relates to improvements in air-compressors that areoperated by steam or other power; and it consists in the combination ofa pulley and belt driven air-pump, a piston-actuated belt-shifter, atwo-way airvalve, and a pressure controlled and actuated lever formoving the air-Valve, admitting to and discharging air from apiston-cylinder, shifting a belt from a tight to a loose pulley,stopping the air-pump when a given pressure has accumulated, andstarting the air-pump when the pressure has fallen below a set pressure.I attain these objects by the mechanism illustrated in theaccompanyingdrawings, in which- Figure 1 is a front elevation of an automaticair-compressor constructed according to my invention. Fig. 2 is a topView of the beltshifter and parts for operating the same. Fig. 3 is anend view of the two-way air-valve. Fig. at is a section taken on theline X Y of Fig. 3.

Similar numerals of reference refer to the same parts in all thefigures.

1 represents the driving-belt; 2, the driving-pulley; 3, the loosepulley, and 4 the airpump. This air-pump is single-acting and isprovided with an inlet and a discharge check-valve placed in the bottomof the cylinder.

5 is the pipe for carrying the compressed air from the pump to thereservoir.

6 is a branch pipe carrying air to the twoway valve. I

7 is a branch pipe carrying air-pressure to the diaphragm-regulator.

Sis the regulator-lever; 8, the adjustable weight; 9, the connecting-rodconnecting the lever 8 to arm 10 on valve-spindle 16.

11 is the two-way valve; 12, the piston-cylinder; 13, the weighted arm;13, the adjustable weight; 14, the connecting-rod connectand 18.

ing the bell-crank arm of lever 13 to the beltshifter 15. The two-wayvalve is clearly and plainly shown in the enlarged Fgs. 3 and 4'.

11 represents the body of the valve and is constructed with two ports 17and 18.

16 is a spindle-valve provided with a collar 19. This collar is providedwith ports 17 (See Figs. 3 and 4.)

The operation of my invention is as follows: The weight 8 is adjusted onlever 8 so as to rise at, say, a pressnre'of one hundred pounds to thesquare inch, at which pressure the lever 8 will rise and through the rod9 raise arm 10 and rotate the spindle 16, so as to open the air-port 1Sand close the port 17. This will admit air into the piston-cylinder 12.This air forces the piston against lever 13, raises it, and it in turn,through the con nection 14., moves the belt shifter 15 and shifts thebelt 1 from the tight pulley 2 to the loose pulley 3 and stops theair-pum p. When the pressure has fallen below one hundred pounds, thelever 8 falls, rotates the spindlevalve back, closes port 18, and opensport 17. This allows the air to escape from under the piston in thecylinder 12, and the weight 13 is so set that it will shift the belt 1to the pulley 2, as shown in Fig. 1, and start the pump and accumulatethe desired pressure, when it will .be automatically stopped, as beforedescribed. If it be desired to use the pressure to start the pump, 3will be the driven pulley and 2 the loose pulley.

Having, as above, fully described myinvention, what I claim as new, anddesire to secure by Letters Patent, is-- The combination with a belt andpulley driven air-pump, abelt-shifter, a weight applied thereto, tendingto shift the belt to the loose pulley, a piston acting to lift theweight, a two-way valve controlling the admission and exhaust of thepump-pressure to and from the piston and a diaphragm connectioncontrolling the valve, the diaphragm being exposed to the pump-pressure,all substantially as shown and described.

GEORGE E. DRUM.

Witnesses:

JOHN SHINN, E. P. KLINGEB.

